Author Topic: Low budget 750F project - Jetting update, spares request  (Read 2784 times)

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Offline kwbikr

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Low budget 750F project - Jetting update, spares request
« on: January 03, 2012, 11:38:59 am »
I'm getting close to finishing my '78 750F project...My goal was under $500 and I'm a little over since I spent $120 on paint, $100 on brake line materials, a new front tire, and some raw materials from Lowes...the bike was $300 of parts boxes and a roller with a title...Getting all the black off the F was a challenge but here's the prelim look...My paint scheme is a nod to the rc166 race bikes from the 60's...thoughts?
« Last Edit: January 12, 2012, 03:11:20 pm by kwbikr »

Offline lucky

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Re: Low budget 750F project
« Reply #1 on: January 03, 2012, 12:13:49 pm »
I am surprised no one has replied!
Looks like an excellent job!

I like the colors.

Offline wedoo2

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Re: Low budget 750F project
« Reply #2 on: January 03, 2012, 12:20:36 pm »
Well now, look at you.  That is a beaut.  Running okay with the stacks?  I take it that since you saved a lot of money that the engine was okay in the first place.
Some days the sun is too loud.

Offline kwbikr

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Re: Low budget 750F project
« Reply #3 on: January 03, 2012, 01:39:09 pm »
Yep, I made it run before taking it apart just to be certain...the stacks are stock F parts but haven't run it open yet...the carbs are not correct for this model but cleaned up nicely so should work OK...the inside looked very good...

Offline d3buttz

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Re: Low budget 750F project
« Reply #4 on: January 03, 2012, 03:35:56 pm »
Great job! I'm not a fan of the f2 comstars, but you made them look great!
http://forums.sohc4.net/index.php?topic=80508.0

1975 cb750f
1975 cb550k
1972 cb350k
1974 tl125
1996 Nissan pathfinder
1972 Datsun 240z
2002 Nissan sentra se-r spec-v

Offline hapakev

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Re: Low budget 750F project
« Reply #5 on: January 04, 2012, 06:43:37 am »
Looking Good Dude!
Smoking Jack
1978 CB750F(ish)

"Keep moving forward, until you can no longer move" KP

Offline Toxic

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Re: Low budget 750F project
« Reply #6 on: January 04, 2012, 07:33:54 am »
I've seen guys spend a heck of allot more with less results.

Very nice looking bike, congrats

Offline HonderCB

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Re: Low budget 750F project
« Reply #7 on: January 04, 2012, 07:37:07 am »
how could anybody not like 1st gen comstars?  Its the later model wheels on the DOHC bikes with a 16" rear and drum brake that are ugly IMO. you have done a great job with your limited budget.  Bike looks great.
-Scott, just a F'er from Illinois-

77' CB750F
81' CB650C - SOLD

Offline hapakev

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Re: Low budget 750F project
« Reply #8 on: January 04, 2012, 07:52:17 am »
How much did you cut off the front of your seat?  It looks great, but how do you secure it now?  I dont see a seat lock anymore.  Just curious, the bike really looks good.
Smoking Jack
1978 CB750F(ish)

"Keep moving forward, until you can no longer move" KP

Offline kwbikr

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Re: Low budget 750F project
« Reply #9 on: January 04, 2012, 09:01:59 am »
How much did you cut off the front of your seat?  It looks great, but how do you secure it now?  I dont see a seat lock anymore.  Just curious, the bike really looks good.

I cut about a foot off the pan in the middle, behind the mounting bracket...I knew I wanted to keep the tail cowl on it so fitted and welded the rear section back on to the shortened pan. I had to cut the foam down and cover accordingly, as well as the trim strips for the sides. I kept the lock but the bike didn't have the right key anyway, so I'll be modifying it to eliminate the key lock mechanism and retain the centering cone/latch. It sits well without it but I want it to latch securely at some point...the rear cowl was broken and I repaired it with a plastic "weld" product and it came out OK...you can see the fixes in this shot during the fab...the front ears were broken off, and since I wanted to keep the shortened trim strips...I also wanted to put the (xs650) tailight under the seat cowl so wanted to retain the seat mounting position...

Offline dagersh

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Re: Low budget 750F project
« Reply #10 on: January 04, 2012, 09:26:57 am »
KW,

That paintwork is stunning!  I really like the yellow scallop on the silver!  It is subtle, but dramatic - I know that does not make sense, but I can't describe my reaction to it any better.  Maybe because it looks like a reflection?

Nice job man!!!

Gersh
1962 CA95
1966 Black Bomber
1966 CA77 Dream
1967 Superhawk
1970 CB750K0
1972 CL350
1972 CB450/500 Custom
1972 CB500K1
1975 CB550F
1976 CB400F
1975 CB750 Future Restoration
1976 CB750K6
1976 CB750F
1976 GL1000


1968 Suzuki T500 Cobra
1990 BMW K1
2001 'Busa
2003 RC 51
Bunch of Guzzi's

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Offline wedoo2

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Re: Low budget 750F project
« Reply #11 on: January 04, 2012, 06:12:52 pm »
I agree Dagersh.  When I first looked at this bike I thought damnation.  Too much?  But I really think it works.  The black on the covers are a great touch with the pipes, and I agree with the yellow. (Where the hell did that come from?).  And that frame is freakin RED.  There is absolutely no chance anyone will  look at that bike and not have an opinion.  Very cool.
« Last Edit: January 04, 2012, 06:14:58 pm by wedoo2 »
Some days the sun is too loud.

Offline cmonSTART

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Re: Low budget 750F project
« Reply #12 on: January 04, 2012, 06:37:28 pm »
I really like your seat mod.  I've been pondering what to do with mine. 

I also love what you've done with the controls.  I want to do rearsets on mine and was thinking of doing something similar.  Having your shift lever like it is, does it reverse which direction your upshift/downshift is?
1981 GL1100 Interstate
1978 CB750F Project

Offline mrrch

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Re: Low budget 750F project
« Reply #13 on: January 04, 2012, 07:15:11 pm »
Nice build on a great budget. I like the red frame.
my build

1977 CB750K WITH 1976 CB750F ENGINE

Offline kwbikr

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Re: Low budget 750F project
« Reply #14 on: January 05, 2012, 06:05:55 am »
Yeah, I really swallowed hard when I pulled the little HVLP trigger on the HOK chrome yellow...but I'm no pioneer (see attached rc166 pic) and really wanted to go with Honda colors...the red is "pure" red and the silver is a Benz metallic with 25grams of white pearls in it. The black is wrinkle on the engine parts (not the pipes). I like the look now...

I "made" the rearsets by cutting up the castings and yes, the shift pattern is reversed. I've gotten used to many patterns as I have a number of them in my garage including a Norton with up for low on the right side...so far only one brain fart in 40+ years of riding when I downshifted my RD350 long ago with a similarly reversed shifter on a track in the middle of a corner at WFO...the brake pedal is shortened by about 4 inches and I welded the peg mount right to the top of the lever. Since my foot stays put it works nicely...

Offline kwbikr

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Re: Low budget 750F project
« Reply #15 on: January 07, 2012, 07:43:11 pm »
50 here in Indy, rode yesterday and today about 60 miles...still pretty brisk even with all the cover...worth every minute though...BTW, I'm running stock Keihins open with an unmuffled pipe...putting some 120 mains in it to start but any guidance on jetting similar appreciated...thanks.

Offline kwbikr

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Re: Low budget 750F project
« Reply #16 on: January 12, 2012, 03:09:32 pm »
I asked about jetting and there was a lot of information, thanks. I eventually went with '76 Keihin's and stock needles and pilots, 120 mains...It now starts and runs very cleanly throughout the rev range...

Special request: Does anyone have a spare set of (or source for) the little stainless buffers that go between the caliper and the pads on my '78 cb750F brakes? I had 4 of them, put them on the front and left them off the rear...I'd like to put them back on if I can find some...thanks for any response...

Offline dakota

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Re: Low budget 750F project - Jetting update, spares request
« Reply #17 on: January 12, 2012, 11:47:45 pm »
Hi,
Very nice build!
I have just finished with tuning my F2. Everything is stock, except for the carbs, I am not using the air filter but stocks.  I have put the bike several times on the dyno for some testing. We started with 120 mains, needles on 2. The bike behaeved well, but then we changed to mains 130 and it ran even better.
regards

Offline wedoo2

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Re: Low budget 750F project - Jetting update, spares request
« Reply #18 on: January 13, 2012, 02:40:05 am »
I don't think I have seen a Honda where the comstars matched the bike so well, especially silver. 

You know KW, that there are enough  Hoosiers on this site that we could have a SOHC rally of our own?  The Honder Hoosiers, or some such thing.

Are you going to the Super Bowl Experience downtown?
Some days the sun is too loud.

Offline kwbikr

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Re: Low budget 750F project - Jetting update, spares request
« Reply #19 on: January 13, 2012, 05:23:59 am »
I don't think I have seen a Honda where the comstars matched the bike so well, especially silver. 

You know KW, that there are enough  Hoosiers on this site that we could have a SOHC rally of our own?  The Honder Hoosiers, or some such thing.

Are you going to the Super Bowl Experience downtown?

You should come over to the Taco Tuesday in Brownsburg some night, great bunch of rider/builders...Or the Steer-Inn on a Thursday (whe weather permits)...It would be great to see all the SOHC bikes in one place though, you plan it and I'll be there... ;D

I may get to the SB experience at some point, but alas will be travelling on business on that Sunday...Hope the weather is decent...